...
While cleaning the carb SSC guys have also disturbed the golden screw of the carb and it was returning 38KMPL only instead of 61 KMPL (before service)....
After going through a post by MSN1 in this thread I tried to retune my carb with 3.25-3.3 turns from tight position and now it's returning 50 KMPL.

...
The default AFR Screw setting is 2.0 turnsout, though one might set it slightly richer with 2.25-2.5 turns out. But am still running on stock set-up, so ask someone who have worked with the carb to help you with an optimum AFR Setting...

...
Is it possible for us to find the CO% without visiting the SVC ? Like say visiting a centre that does pollution checks for vehicles.

...
My GS vibrates too - unusually near 4500 rpm ! But this is occasional. So I too will wait what others suggest.

Please refer the pictures you asked for. After recent service from SSC I am facing mileage and ride quality issues with small hiccups and vibrations in all gears but they are noticeable to me. While cleaning the carb SSC guys have also disturbed the golden screw of the carb and it was returning 38KMPL only instead of 61 KMPL (before service). SO I decided to tune it myself. After going through a post by MSN1 in this thread I tried to retune my carb with 3.25-3.3 turns from tight position and now it's returning 50 KMPL. Still I am not happy with the same as VIBRATIONS and small hiccups are prevailing and I wish I could achieve my old mileage figures of 61KMPL.

How much does GiXXeR-155's chain-set cost?
Can you post photo of chain-side rear-axle nut/bolt? I would like to see the position of slack adjuster nut.

What was the price of Ceat Zoom 100/90-18" ?

Lets see how new tyre ceat zoom 100/90- 18 performs. Looks great by design and feels like a soft compound by nail test. Pls do share your review if anyone of us has same tyre on their gs.

Below future mods / experiment are on the way.
2. Shift the front disc to right side.

There is no difference if the disc is on the left or right. The braking force is in the end distributed to the centre of the wheel and the wheel slows down when braked.
Each maker has their unique way of making their brake and drive train layout.
Most of the Indian bikes have a left side drain chain config, however most italian and non-jap bikes have right sided layout. Does that mean, the bike will pull to a side?
The design interest of each maker is unique in their own ways.
Suzuki's brakes are made by a company called Tokico, Japan.
TVS-Suzuki introduced their first disc brake model, the TVS-Suzuki Fiero and the Tokico design disc brakes were locally produced in india by M/S TVS Girling aka Brakes India Ltd.
TVS continued their left side disc approach after the JV broke on the TVS Fiero and Fiero F2.
later they changed their interest to right side disc from the days of the Victor GLX 125. SO did the Apache and RTR.
Suzuki is now independent. The Suzuki Zues and GS150 is based on their GS platform sold abroad. All have Tokico made Left side disc. So to locally produce them, the design was outsourced to Pricol India Ltd.
There is no technical advantage of having a right sided disc or vice versa.
Hyosung is a Suzuki partnered company and hence chose the left side disc approach. Yamaha and Honda always make right side disc configs.

Cheers,
Joel

...
Solution:
My Suzuki service center head mechanic suggested me to replace the same with Gixxer sprockets and chain for my 2008-09 model Suzuki GS150R as it's a direct fit for the same without any issues. According to him it would last even longer than Gixxer as it would be under cover in our GS150R.
...

From Gixxer Spares doc:
Front Sprocket : 15 t
Rear Sprocket : 45 t

Final Drive Ratio : 45 / 15 = 3.00 same as last GS150R 14/42 -> shouldn't be a problem. ;-)

Couple of questions.
You replaced the chain/sprocket of your GS with that of Gixxer?
Are they compatible?
The teeth count of sprockets are the same for both the bikes?
Some mechanics blindly say Unicorn chain/sprocket can be used on a Hunk, but Hunk's front sprocket is 14T while Unicorn's is 15T. Using Uni's 15T sprocket will kill the quick pickup/acceleration of Hunk.
Just my two cents.

Solution:
My Suzuki service center head mechanic suggested me to replace the same with Gixxer sprockets and chain for my 2008-09 model Suzuki GS150R as it's a direct fit for the same without any issues. According to him it would last even longer than Gixxer as it would be under cover in our GS150R.

Results after Installation:
Fairly new feeling, my beast is back to it's smoothness and pickup without any sound or roughness.

I hope this will help all fellow GS 150R owners to resolve their chain related issues

What brand of tyre is that? I tried to find out the brand online but didn't find any 120/R18. Please share the brand and make of the tyre. (Also the cost, if you don't mind)